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77 lines
2 KiB
Ruby
77 lines
2 KiB
Ruby
module Arel
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module Visitors
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class MySQL < Arel::Visitors::ToSql
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private
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def visit_Arel_Nodes_Union o, collector, suppress_parens = false
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unless suppress_parens
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collector << "( "
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end
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collector = case o.left
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when Arel::Nodes::Union
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visit_Arel_Nodes_Union o.left, collector, true
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else
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visit o.left, collector
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end
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collector << " UNION "
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collector = case o.right
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when Arel::Nodes::Union
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visit_Arel_Nodes_Union o.right, collector, true
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else
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visit o.right, collector
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end
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if suppress_parens
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collector
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else
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collector << " )"
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end
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end
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def visit_Arel_Nodes_Bin o, collector
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collector << "BINARY "
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visit o.expr, collector
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end
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###
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# :'(
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# http://dev.mysql.com/doc/refman/5.0/en/select.html#id3482214
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def visit_Arel_Nodes_SelectStatement o, collector
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if o.offset && !o.limit
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o.limit = Arel::Nodes::Limit.new(Nodes.build_quoted(18446744073709551615))
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end
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super
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end
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def visit_Arel_Nodes_SelectCore o, collector
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o.froms ||= Arel.sql('DUAL')
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super
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end
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def visit_Arel_Nodes_UpdateStatement o, collector
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collector << "UPDATE "
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collector = visit o.relation, collector
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unless o.values.empty?
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collector << " SET "
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collector = inject_join o.values, collector, ', '
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end
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unless o.wheres.empty?
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collector << " WHERE "
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collector = inject_join o.wheres, collector, ' AND '
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end
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unless o.orders.empty?
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collector << " ORDER BY "
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collector = inject_join o.orders, collector, ', '
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end
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maybe_visit o.limit, collector
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end
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end
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end
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end
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